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userlib: Add halt() helper, detect this in the host kernel - #2780
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This tweaks the jefe task to allow for host builds, and adds it to the demo app. Ping/Pong actually works as expected now.
Previously, there were some annoying `Eof:` errors printed by tasks when the kernel stopped. This PR adds some in-band signaling to allow the kernel to tell tasks it's time to shut down.
This formalizes the "I'm dead and don't restart me" behavior used in various places in the code by adding a `userlib::hl` helper for it. We also can now detect this on host runs, halting the host system if something fatal has occurred. Also adds a flag to opt-out of this new behavior if you are testing something that SHOULD do that.
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labbott
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I don't love fn halt as a name for nebulous reasons but I also don't actually have serious objections or a better name (we can see if anyone else does?)
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This formalizes the "I'm dead and don't restart me" behavior used in various places in the code by adding a
userlib::hlhelper for it.We also can now detect this on host runs, halting the host system if something fatal has occurred. Also adds a flag to opt-out of this new behavior if you are testing something that SHOULD do that.
Stacked on top of #2778 and #2779.